Workaround nim-lang/Nim#16664

flambeau.nim

@@ -36,8 +36,8 @@ export serialize
 # C++ Standard Library
 # ----------------------------------------------------------------
 
-import ./flambeau/cpp/std_cpp
-export std_cpp
+import ./flambeau/cpp/[std_cpp, emitters]
+export std_cpp, emitters
 
 # Convenience helpers
 # ----------------------------------------------------------------

flambeau/cpp/emitters.nim

@@ -0,0 +1,13 @@
+# Special emit - https://github.com/nim-lang/Nim/blob/acf3715/compiler/ccgstmts.nim#L1489-L1495
+
+template emitTypes*(typesection: static string): untyped =
+  ## Emit a C/C++ typesection
+  {.emit: "/*TYPESECTION*/\n" & typesection.}
+
+template emitGlobals*(globals: static string): untyped =
+  ## Emit a C/C++ global variable declaration
+  {.emit: "/*VARSECTION*/\n" & globals.}
+
+template emitIncludes*(includes: static string): untyped =
+  ## Emit a C/C++ global variable declaration
+  {.emit: "/*INCLUDESECTION*/\n" & includes.}

proof_of_concepts/poc09_end_to_end.nim

@@ -5,13 +5,21 @@ import
   ../flambeau,
   std/[enumerate, strformat]
 
-# Net is defined in poc_09_end_to_end_types.nim.hpp
-# to work around https://github.com/nim-lang/Nim/issues/16664
-# which workarounds https://github.com/nim-lang/Nim/issues/4687
+# Inline C++
+# workaround https://github.com/nim-lang/Nim/issues/16664
+# and workaround https://github.com/nim-lang/Nim/issues/4687
+
+emitTypes:
+  """
+  struct Net: public torch::nn::Module {
+    torch::nn::Linear fc1{nullptr};
+    torch::nn::Linear fc2{nullptr};
+    torch::nn::Linear fc3{nullptr};
+  };
+  """
 
 type Net
-  {.pure, importcpp,
-    header:"poc09_end_to_end_types.nim.hpp".}
+  {.pure, importcpp.}
     = object of Module
   fc1: Linear
   fc2: Linear